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An interpretation of the broadband VLF waves near the Io torus as observed by UlyssesThe requirements for the Ulysses trajectory to attain high ecliptic latitudes using a Jovian gravitational assist resulted in a fortuitous passage through the Io torus region. Specifically, the spacecraft spent many hours at latitudes just above the torus. During this time the low-frequency cutoff of an ordinary mode (O mode) emission allowed a determination of the local electron plasma frequency (i.e., electron density) along the northern flank of the torus. Also, near a Jovian System III longitude of 100 deg, the spacecraft flew past a set of active field lines that have been previously identified to be associated with the hectometric generation region. During the passage, Ulysses observed a newly discovered O mode component and a whistler mode emission similar to that observed by Voyager 1 13 years previously. All of the broadband VLF emissions imply the presence of a particular population of electrons. We suggest that broadband VLF emissions can be used as a `particle detector' to qualitatively measure the electron plasma conditions in the torus region and identify active regions.
Document ID
19950046646
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Farrell, W. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Macdowell, R. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hess, R. A.
(Hughes STX, Lanham, MD United States)
Kaiser, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Desch, M. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stone, R. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A12
ISSN: 0148-0227
Subject Category
Astronomy
Accession Number
95A78245
Distribution Limits
Public
Copyright
Other

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